<SEC-DOCUMENT>0001562180-18-003327.txt : 20180718
<SEC-HEADER>0001562180-18-003327.hdr.sgml : 20180718
<ACCEPTANCE-DATETIME>20180718102750
ACCESSION NUMBER:		0001562180-18-003327
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20180716
FILED AS OF DATE:		20180718
DATE AS OF CHANGE:		20180718

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Maggio Paula C
		CENTRAL INDEX KEY:			0001293826

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10816
		FILM NUMBER:		18957860

	MAIL ADDRESS:	
		STREET 1:		C/O STRATEGIC HOTEL CAPITAL, INC.
		STREET 2:		77 WEST WACKER DRIVE, STE 4600
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60601

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MGIC INVESTMENT CORP
		CENTRAL INDEX KEY:			0000876437
		STANDARD INDUSTRIAL CLASSIFICATION:	SURETY INSURANCE [6351]
		IRS NUMBER:				391486475
		STATE OF INCORPORATION:			WI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		250 EAST KILBOURN AVENUE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53202
		BUSINESS PHONE:		4143476480

	MAIL ADDRESS:	
		STREET 1:		250 EAST KILBOURN AVENUE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53202
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primarydocument.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-07-16</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0000876437</issuerCik>
        <issuerName>MGIC INVESTMENT CORP</issuerName>
        <issuerTradingSymbol>MTG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001293826</rptOwnerCik>
            <rptOwnerName>Maggio Paula C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>250 EAST KILBOURN AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MILWAUKEE</rptOwnerCity>
            <rptOwnerState>WI</rptOwnerState>
            <rptOwnerZipCode>53202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Executive Vice President-Law</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-07-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20000.00</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20000.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">One-third of these Share Units vest on July 16 of each of the three years beginning in 2019, subject to the reporting person's continued employment with the Issuer.</footnote>
        <footnote id="F2">These shares were awarded to the reporting person pursuant to the Issuer's 2015 Omnibus Incentive Plan and no price was paid by the reporting person for the shares.</footnote>
    </footnotes>

    <remarks>This Form 4 is being signed by the reporting person's attorney-in-fact pursuant to a previously filed power of attorney.</remarks>

    <ownerSignature>
        <signatureName>Dan D. Stilwell, Attorney-in-Fact</signatureName>
        <signatureDate>2018-07-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>maggio.txt
<DESCRIPTION>POA
<TEXT>



Limited Power of Attorney


KNOW ALL BY THESE PRESENTS, that the undersigned is required,
or may be required in the future, to file reports of changes
in beneficial ownership of equity securities of MGIC Investment
Corporation (the "Company").

To facilitate the filing of these reports, the undersigned
hereby appoints each person who is the Chief Financial Officer,
the Associate General Counsel, any Assistant General Counsel
the Secretary, or any Assistant Secretary of the Company
as the undersigned's attorney-in-fact
and agent to: (i) apply on behalf of the undersigned for
access codes (if necessary) for the EDGAR System, and
(ii) sign on behalf of the undersigned any Form 3, Form 4,
or Form 5 to be filed by the undersigned with the SEC
or any securities exchange.

Each of the persons authorized to act as such attorney-in-fact
and agent above may do so separately without the concurrence of
the other persons.  The authority granted hereunder is granted
to the person occupying the position specified at the time such
authority is exercised.

Dated: July 16, 2018



Signature: (S) Paula C. Maggio

Please print name:  Paula C. Maggio
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
